What is reality? Is this what we all believe? That everything exists independently of us or that everything exists because we make it exist in our minds. An ancient philosopher, René Descartes, considered the father of modern philosophy, proposed that humans are made up of two different compounds, the body and the mind. He saw the body as a complex machine but he was sure the mind was completely different. He tried an experiment. He tried to imagine that he had no physical body and was floating like a ghost, then he tried another experiment, he tried to imagine that he had no mind, but it was impossible because if you don't have a mind, how can you imagine anything at all. He summed up his thoughts in the phrase “I think.” That's why I am. Our body is like the hardware of a computer and our mind is the software. How do we know that what is there is really there? Take a chair for example, how do you know if the chair is still there if you're not there to see it. As far as we know the chair can stand up and go out the window and visit any place in the world or even v...